Combine all of the ingredients in a large pot and bring to a boil. Reduce the heat to low; simmer for 20 minutes. Ladle into mugs and serve warm. If you want to strain off bits of spices and fruit that are floating in the cider, you can pour the liquid through a fine mesh sieve or cheesecloth before serving.
Notes
Slow Cooker Instructions: Place all of the ingredients in the slow cooker. Cover and cook on LOW for about 4 hours.Alcohol: If you prefer an adult beverage, you can spike individual glasses with alcohol or add the alcohol of your choice to the pot. Just make sure that you stir in the alcohol at the end of the cooking time so that you don't cook off the alcohol. Good mix-ins for mulled cider include bourbon, rum, brandy, Calvados (an apple brandy), or even whiskey.